Circumference and Area of Circles Flashcard

Front

What is the formula to find the area of a circle?

Back

Area = π × r², where r is the radius.

Front

How do you find the radius of a circle if the diameter is given?

Back

Divide the diameter by 2.

Front

What is the formula to find the circumference of a circle?

Back

Circumference = π × d, where d is the diameter.

Front

If a circle has a diameter of 10 m, what is its circumference?

Back

31.4 m (Circumference = π × 10).

Front

What is the radius of a circle with a diameter of 4 feet?

Back

2 feet (Radius = Diameter / 2).

Front

What is the area of a circle with a diameter of 6 meters?

Back

28.26 m² (Area = π × (3)²).

Front

What does π (pi) represent in circle calculations?

Back

π is a constant approximately equal to 3.14, used in calculations involving circles.

Front

If the radius of a circle is 5 cm, what is the area?

Back

78.5 cm² (Area = π × (5)²).

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

How do you convert diameter to radius?

Back

Radius = Diameter / 2.